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Goodwill - Schedule of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Goodwill [Line Items] |  |  |  |  |
Beginning balance |  |  | $ 28,414 |  |
Goodwill impairment | $ (120) | $ (6,100) | (300) | $ (6,100) |
Ending balance | 27,648 |  | 27,648 |  | $ 28,414
International Markets [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment | 0 |  |  |  |
Operating Segments [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning balance |  |  |  | 28,414 | 28,414
Relative fair value allocation |  |  |  |  | (28,414)
Operating Segments [Member] | Generics [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning balance |  |  |  | 18,864 | 18,864
Relative fair value allocation |  |  |  |  | (18,864)
Operating Segments [Member] | Specialty [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning balance |  |  |  | 8,464 | 8,464
Relative fair value allocation |  |  |  |  | (8,464)
Operating Segments [Member] | Other Segments [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning balance |  |  |  | $ 1,086 | 1,086
Relative fair value allocation |  |  |  |  | (1,086)
Reportable Geographical Components [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning balance |  |  | 28,414 |  |
Goodwill impairment |  |  | (300) |  |
Relative fair value allocation |  |  |  |  | 28,414
Goodwill disposal |  |  | (68) |  |
Translation differences |  |  | (398) |  |
Ending balance | 27,648 |  | 27,648 |  | 28,414
Reportable Geographical Components [Member] | Other Segments [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning balance |  |  | 2,865 |  |
Relative fair value allocation |  |  |  |  | 2,865
Translation differences |  |  | (3) |  |
Ending balance | 2,862 |  | 2,862 |  | 2,865
Reportable Geographical Components [Member] | North America [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning balance |  |  | 11,144 |  |
Relative fair value allocation |  |  |  |  | 11,144
Translation differences |  |  | (16) |  |
Ending balance | 11,128 |  | 11,128 |  | 11,144
Reportable Geographical Components [Member] | Europe [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning balance |  |  | 9,001 |  |
Relative fair value allocation |  |  |  |  | 9,001
Goodwill disposal |  |  | (54) |  |
Translation differences |  |  | (306) |  |
Ending balance | 8,641 |  | 8,641 |  | 9,001
Reportable Geographical Components [Member] | International Markets [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning balance |  |  | 5,404 |  |
Goodwill impairment |  |  | (300) |  |
Relative fair value allocation |  |  |  |  | 5,404
Goodwill disposal |  |  | (14) |  |
Translation differences |  |  | (73) |  |
Ending balance | $ 5,017 |  | $ 5,017 |  | $ 5,404

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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